The Food and Drug Administration (FDA) has now flagged more than 80 varieties of hand sanitizers it says have tested positive for methanol contamination which can lead to blindness, heart problems and death.

The active ingredient that kills germs in legitimate sanitizers is ethyl alcohol, which is consumable. But some companies -- mostly from Mexico -- have been replacing it with poisonous methanol, or wood alcohol, which is used in antifreeze.

The FDA first issued a consumer warning about the products last month.

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